LOCAL INFLUENCE ASSESSMENT IN A MULTIVARIATE t-MODEL WITH RAOS SIMPLE STRUCTURE

The local influence analysis is an important problem in statistical inference and some models have been discussed in many literatures[1- 5]. This paper deals with the problem of assessing local influences in a multivariate t-model with Rao's simple structure(RSS). Based on Cook's likelihood displacement, the effects of some minor perturbation on the statistical inference is assessed. As an application, a common covariance-weighted perturbation is thoroughly discussed.

作 者： Zou Qingming Zhang Huaixiong   作者單位： Zou Qingming(College of Economics and Management, Nanhua University, Hengyang 421001, China)

Zhang Huaixiong(College of Information, Yunnan University, Kunming 650091, China) 

刊 名： 數(shù)學(xué)物理學(xué)報(bào)（英文版）  ISTIC SCI 英文刊名： ACTA MATHEMATICA SCIENTIA  年，卷(期)： 2005 25(1)  分類號(hào)：   關(guān)鍵詞： Multivariate t-model   Rao's simple structure   ω-model   likelihood displacement   MLE  

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